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题库解析   >   其他题型   >   自测章CR66-82
    本题由hyman1提供
72次学习
自测章CR66-82

Some batches of polio vaccine used around 1960 were contaminated with SV40, a virus that in monkeys causes various cancers. Some researchers now claim that this contamination caused some cases of a certain cancer in humans, mesothelioma. This claim is not undercut by the fact that a very careful survey made in the 1960s of people who had received the contaminated vaccine found no elevated incidence of any cancer, since ___________.

    <p>(A) most cases of mesothelioma are caused by exposure to asbestos<br/>(B) in some countries, there was no contamination of the vaccine<br/>(C) SV40 is widely used in laboratories to produce cancers in animals<br/>(D) mesotheliomas take several decades to develop<br/>(E) mesothelioma was somewhat less common in 1960 than it is now</p>
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答案:
D

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